diff --git a/README b/README
index f200c8b..d2f67d7 100644
--- a/README
+++ b/README
@@ -116,3 +116,7 @@ Change the management key used for administrative authentication:
 
   yubico-piv-tool -n 0807605403020108070605040302010807060504030201 \
     -a set-mgm-key
+
+Delete a certificate in slot 9a:
+
+  yubico-piv-tool -a delete-certificate -s 9a
diff --git a/yubico-piv-tool.h2m b/yubico-piv-tool.h2m
index 9bccbcb..760143e 100644
--- a/yubico-piv-tool.h2m
+++ b/yubico-piv-tool.h2m
@@ -64,3 +64,7 @@ Change the management key used for administrative authentication:
 
    yubico-piv-tool -n 0807605403020108070605040302010807060504030201 \\\n
      -a set-mgm-key
+
+Delete a certificate in slot 9a:
+
+  yubico-piv-tool -a delete-certificate -s 9a