diff --git a/changes/bug25581 b/changes/bug25581
new file mode 100644
index 000000000..86f2491db
--- /dev/null
+++ b/changes/bug25581
@@ -0,0 +1,4 @@
+  o Minor bugfixes (configuration):
+    - Remove undescores from the _HSLayer{2,3}Nodes options. This expert-user
+      configuration can now be enabled as HSLayer{2,3}Nodes. Fixes bug 25581;
+      bugfix on 0.3.3.1-alpha
diff --git a/doc/tor.1.txt b/doc/tor.1.txt
index ea42fc086..c3493f718 100644
--- a/doc/tor.1.txt
+++ b/doc/tor.1.txt
@@ -1533,7 +1533,7 @@ The following options are useful only for clients (that is, if
     If no nodes in Tor2webRendezvousPoints are currently available for
     use, Tor will choose a random node when building HS circuits.
 
-[[_HSLayer2Nodes]] **_HSLayer2Nodes** __node__,__node__,__...__::
+[[HSLayer2Nodes]] **HSLayer2Nodes** __node__,__node__,__...__::
     A list of identity fingerprints, nicknames, country codes, and
     address patterns of nodes that are allowed to be used as the
     second hop in all client or service-side Onion Service circuits.
@@ -1543,7 +1543,7 @@ The following options are useful only for clients (that is, if
     (Default: Any node in the network may be used in the second hop.)
  +
     (Example:
-    _HSLayer2Nodes ABCD1234CDEF5678ABCD1234CDEF5678ABCD1234, \{cc}, 255.254.0.0/8) +
+    HSLayer2Nodes ABCD1234CDEF5678ABCD1234CDEF5678ABCD1234, \{cc}, 255.254.0.0/8) +
  +
     When this is set, the resulting hidden service paths will
     look like:
@@ -1560,7 +1560,7 @@ The following options are useful only for clients (that is, if
     Rend, HSDir, and Intro point selection is not affected by this
     option.
  +
-    This option may be combined with _HSLayer3Nodes to create
+    This option may be combined with HSLayer3Nodes to create
     paths of the form:
  +
         C - G - L2 - L3 - Rend +
@@ -1570,7 +1570,7 @@ The following options are useful only for clients (that is, if
         S - G - L2 - L3 - HSDir +
         S - G - L2 - L3 - Intro +
  +
-    ExcludeNodes have higher priority than _HSLayer2Nodes,
+    ExcludeNodes have higher priority than HSLayer2Nodes,
     which means that nodes specified in ExcludeNodes will not be
     picked.
  +
@@ -1578,10 +1578,10 @@ The following options are useful only for clients (that is, if
     https://github.com/mikeperry-tor/vanguards that selects and
     updates this set of nodes for you. Hence it does not do load
     balancing if fewer than 20 nodes are selected, and if no nodes in
-    _HSLayer2Nodes are currently available for use, Tor will not work.
+    HSLayer2Nodes are currently available for use, Tor will not work.
     Please use extreme care if you are setting this option manually.
 
-[[_HSLayer3Nodes]] **_HSLayer3Nodes** __node__,__node__,__...__::
+[[HSLayer3Nodes]] **HSLayer3Nodes** __node__,__node__,__...__::
     A list of identity fingerprints, nicknames, country codes, and
     address patterns of nodes that are allowed to be used as the
     third hop in all client and service-side Onion Service circuits.
@@ -1591,7 +1591,7 @@ The following options are useful only for clients (that is, if
     (Default: Any node in the network may be used in the third hop.)
  +
     (Example:
-    _HSLayer3Nodes ABCD1234CDEF5678ABCD1234CDEF5678ABCD1234, \{cc}, 255.254.0.0/8) +
+    HSLayer3Nodes ABCD1234CDEF5678ABCD1234CDEF5678ABCD1234, \{cc}, 255.254.0.0/8) +
  +
     When this is set by itself, the resulting hidden service paths
     will look like: +
@@ -1607,7 +1607,7 @@ The following options are useful only for clients (that is, if
     option.
  +
     While it is possible to use this option by itself, it should be
-    combined with _HSLayer2Nodes to create paths of the form:
+    combined with HSLayer2Nodes to create paths of the form:
  +
         C - G - L2 - L3 - Rend +
         C - G - L2 - L3 - M - HSDir +
@@ -1616,7 +1616,7 @@ The following options are useful only for clients (that is, if
         S - G - L2 - L3 - HSDir +
         S - G - L2 - L3 - Intro +
  +
-    ExcludeNodes have higher priority than _HSLayer3Nodes,
+    ExcludeNodes have higher priority than HSLayer3Nodes,
     which means that nodes specified in ExcludeNodes will not be
     picked.
   +
@@ -1624,7 +1624,7 @@ The following options are useful only for clients (that is, if
     https://github.com/mikeperry-tor/vanguards that selects and
     updates this set of nodes for you. Hence it does not do load
     balancing if fewer than 20 nodes are selected, and if no nodes in
-    _HSLayer3Nodes are currently available for use, Tor will not work.
+    HSLayer3Nodes are currently available for use, Tor will not work.
     Please use extreme care if you are setting this option manually.
 
 [[UseMicrodescriptors]] **UseMicrodescriptors** **0**|**1**|**auto**::
diff --git a/src/or/config.c b/src/or/config.c
index 9cd66cbf6..456d44dd2 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -172,6 +172,9 @@ static config_abbrev_t option_abbrevs_[] = {
   { "HashedControlPassword", "__HashedControlSessionPassword", 1, 0},
   { "VirtualAddrNetwork", "VirtualAddrNetworkIPv4", 0, 0},
   { "SocksSocketsGroupWritable", "UnixSocksGroupWritable", 0, 1},
+  { "_HSLayer2Nodes", "HSLayer2Nodes", 0, 1 },
+  { "_HSLayer3Nodes", "HSLayer3Nodes", 0, 1 },
+
   { NULL, NULL, 0, 0},
 };
 
@@ -419,8 +422,8 @@ static config_var_t option_vars_[] = {
   V(Socks5ProxyPassword,         STRING,   NULL),
   VAR("KeyDirectory",            FILENAME, KeyDirectory_option, NULL),
   V(KeyDirectoryGroupReadable,   BOOL,     "0"),
-  VAR("_HSLayer2Nodes",          ROUTERSET,  HSLayer2Nodes,  NULL),
-  VAR("_HSLayer3Nodes",          ROUTERSET,  HSLayer3Nodes,  NULL),
+  VAR("HSLayer2Nodes",           ROUTERSET,  HSLayer2Nodes,  NULL),
+  VAR("HSLayer3Nodes",           ROUTERSET,  HSLayer3Nodes,  NULL),
   V(KeepalivePeriod,             INTERVAL, "5 minutes"),
   V(KeepBindCapabilities,            AUTOBOOL, "auto"),
   VAR("Log",                     LINELIST, Logs,             NULL),