diff --git a/README.md b/README.md
index 1c63d5f5..5451a78e 100644
--- a/README.md
+++ b/README.md
@@ -108,6 +108,15 @@ is **not** possible to define new key bindings.
 <kbd>ctrl</kbd>+<kbd>shift</kbd>+<kbd>r</kbd>
 : Start a scrollback search
 
+<kbd>ctrl</kbd>+<kbd>+</kbd>
+: Increase font size by 1pt
+
+<kbd>ctrl</kbd>+<kbd>-</kbd>
+: Decrease font size by 1pt
+
+<kbd>ctrl</kbd>+<kbd>0</kbd>, <kbd>ctrl</kbd>+<kbd>=</kbd>
+: Reset font size
+
 
 #### Scrollback search
 
diff --git a/doc/foot.1.scd b/doc/foot.1.scd
index 8e708af9..313579fe 100644
--- a/doc/foot.1.scd
+++ b/doc/foot.1.scd
@@ -112,6 +112,15 @@ be changed.
 *ctrl*+*shift*+*r*
 	Start a scrollback search
 
+*ctrl*+*+*
+	Increase font size by 1pt
+
+*ctrl*+*-*
+	Decrease font size by 1pt
+
+*ctrl*+*0*, *ctrl*+*=*
+	Reset font size
+
 ## SCROLLBACK SEARCH
 
 *ctrl*+*r*