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diff --git a/informqr/informqr.md b/informqr/informqr.md
index e12df8e..0dee485 100644
--- a/informqr/informqr.md
+++ b/informqr/informqr.md
@@ -359,4 +359,32 @@ or an explicit return statement:
 To define a dummy standalone routine with N local variables (unless it
 already exists):
 
-    Stub routine N;
\ No newline at end of file
+    Stub routine N;
+
+Flow control
+------------
+
+To execute statements if *expr* is true; optionally, to execute other
+statements if *expr* is false:
+
+    if (expr)
+        statement_block
+    if (expr)
+        statement_block
+    else
+        statement_block
+
+To execute statements depending on the value of *expr*:
+
+    switch (expr) {
+        value: statement; ... statement;
+        value: statement; ... statement;
+        ...
+        default: statement; ... statement;
+        }
+
+where each *value* can be given as:
+
+    constant
+    lo_constant to hi_constant
+    constant,constant, ... constant
\ No newline at end of file