2 files changed, 10 insertions, 0 deletions
diff --git a/format.c b/format.c
index bfc40906..bcb897d6 100644
--- a/format.c
+++ b/format.c
@@ -321,6 +321,13 @@ format_expand(struct format_tree *ft, const char *fmt)
 				break;
 			fmt += n + 1;
 			continue;
+		case '#':
+			while (len - off < 2) {
+				buf = xrealloc(buf, 2, len);
+				len *= 2;
+			}
+			buf[off++] = '#';
+			continue;
 		default:
 			s = NULL;
 			if (ch >= 'A' && ch <= 'Z')
diff --git a/tmux.1 b/tmux.1
index e815fc4e..a2404b4f 100644
--- a/tmux.1
+++ b/tmux.1
@@ -3011,6 +3011,9 @@ for example
 .Ql #{session_name} .
 Some variables also have an shorter alias such as
 .Ql #S .
+.Ql ##
+is replaced by a single
+.Ql # .
 Conditionals are also accepted by prefixing with
 .Ql \&?
 and separating two alternatives with a comma;