diff --git a/contrib/groff/tmac/doc-common b/contrib/groff/tmac/doc-common
index 39d23d98c06d..4251a9678142 100644
--- a/contrib/groff/tmac/doc-common
+++ b/contrib/groff/tmac/doc-common
@@ -232,23 +232,25 @@
 .	if "\\$2"4.4"  .ds oS 4.4BSD
 .\}
 .if "\\$1"FreeBSD" \{\
-.	if "\\$2"2"      .ds oS FreeBSD 2.0
-.	if "\\$2"2.0"    .ds oS FreeBSD 2.0
-.	if "\\$2"2.0.5"  .ds oS FreeBSD 2.0.5
-.	if "\\$2"2.1"    .ds oS FreeBSD 2.1
-.	if "\\$2"2.1.5"  .ds oS FreeBSD 2.1.5
-.	if "\\$2"2.1.6"  .ds oS FreeBSD 2.1.6
-.	if "\\$2"2.1.7"  .ds oS FreeBSD 2.1.7
-.	if "\\$2"2.2"    .ds oS FreeBSD 2.2
-.	if "\\$2"2.2.1"  .ds oS FreeBSD 2.2.1
-.	if "\\$2"2.2.2"  .ds oS FreeBSD 2.2.2
-.	if "\\$2"2.2.5"  .ds oS FreeBSD 2.2.5
-.	if "\\$2"2.2.6"  .ds oS FreeBSD 2.2.6
-.	if "\\$2"2.2.7"  .ds oS FreeBSD 2.2.7
-.	if "\\$2"2.2.8"  .ds oS FreeBSD 2.2.8
-.	if "\\$2"3.0"    .ds oS FreeBSD 3.0
-.	if "\\$2"3.1"    .ds oS FreeBSD 3.1
-.	if "\\$2"4.0"    .ds oS FreeBSD 4.0
+.	ie "\\$2"2"      .ds oS FreeBSD 2.0
+.	el               .ds oS FreeBSD \\$2
+.	    ie \\n(.$==0        \c
+.	el .ie "\\$2"2"         \c
+.	el .ie "\\$2"2.0"       \c
+.	el .ie "\\$2"2.0.5"     \c
+.	el .ie "\\$2"2.1"       \c
+.	el .ie "\\$2"2.1.5"     \c
+.	el .ie "\\$2"2.1.6"     \c
+.	el .ie "\\$2"2.1.7"     \c
+.	el .ie "\\$2"2.2"       \c
+.	el .ie "\\$2"2.2.5"     \c
+.	el .ie "\\$2"2.2.6"     \c
+.	el .ie "\\$2"2.2.7"     \c
+.	el .ie "\\$2"2.2.8"     \c
+.	el .ie "\\$2"3.0"       \c
+.	el .ie "\\$2"3.1"       \c
+.	el .ie "\\$2"4.0"       \c
+.	el .tm Unknown FreeBSD version ``\\$2'' at line \\n(c.
 .\}
 .if "\\*(oS"Null" .ds oS \0\\$1
 .if "\\*(aa"Non-Null" .as oS \0\\$2