diff --git a/src/main/java/arb/expressions/Expression.java b/src/main/java/arb/expressions/Expression.java
index c9cf62e56..9c16355fa 100644
--- a/src/main/java/arb/expressions/Expression.java
+++ b/src/main/java/arb/expressions/Expression.java
@@ -692,8 +692,8 @@ public Node<D, R, F> parse(int depth) throws ExpressionCompilerException
       node = parseFirst(depth + 1);
       if (!parse(depth + 1, ')'))
       {
-        throw new ExpressionCompilerException(format("expected closing parenthesis at: depth=%d startPos=%s, position=%s in "
-                      + "expression '%s' of length %d", depth, startPos, position, expression, expression.length()));
+        throw new ExpressionCompilerException(format("expected closing parenthesis, instead got %c at position %s in "
+                      + "expression '%s'", ch, startPos, expression));
       }
 
     }
diff --git a/src/main/java/arb/functions/real/HypergeometricFunctionSequence.java b/src/main/java/arb/functions/real/HypergeometricFunctionSequence.java
index ca1270b37..0c6cf48a4 100644
--- a/src/main/java/arb/functions/real/HypergeometricFunctionSequence.java
+++ b/src/main/java/arb/functions/real/HypergeometricFunctionSequence.java
@@ -38,7 +38,7 @@ public static void main(String... args)
 
   public final Function<Integer, RealPolynomial> F;
 
-  public static final String                     Fdef = "n➔when(n=0,1,else,x*F(n-1)*(∏α₍ₖ₎(k=1…p)/∏β₍ₖ₎(k=1…q))";
+  public static final String                     Fdef = "n➔when(n=0,1,else,x*F(n-1)*(∏α₍ₖ₎{k=1…p}/∏β₍ₖ₎{k=1…q}))";
 
   public HypergeometricFunctionSequence(int p, int q)
   {