diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a09010..baf4e2e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Elixir 1.16 to CI
 - OTP 26.2 to CI
 
+### Fixed
+
+- Credo warnings about [predicate function
+  names](https://hexdocs.pm/credo/Credo.Check.Readability.PredicateFunctionNames.html)
+
 ## [0.1.2] - 2023-11-04
 
 ### Added
diff --git a/lib/sqids.ex b/lib/sqids.ex
index e19c7f4..9a5d66d 100644
--- a/lib/sqids.ex
+++ b/lib/sqids.ex
@@ -206,7 +206,7 @@ defmodule Sqids do
   end
 
   defp validate_numbers(numbers) do
-    Enum.find(numbers, &(not is_valid_number(&1)))
+    Enum.find(numbers, &(not valid_number?(&1)))
   catch
     :error, %Protocol.UndefinedError{value: ^numbers} ->
       {:error, {:numbers_not_enumerable, numbers}}
@@ -219,7 +219,7 @@ defmodule Sqids do
       {:error, {:number_is_not_a_non_negative_integer, invalid_number}}
   end
 
-  defp is_valid_number(number), do: is_integer(number) and number >= 0
+  defp valid_number?(number), do: is_integer(number) and number >= 0
 
   # if no numbers passed, return an empty string
   @spec encode_numbers(t(), [non_neg_integer]) :: {:ok, String.t()} | {:error, term}
@@ -267,7 +267,7 @@ defmodule Sqids do
 
     id = handle_min_length_requirement(id_iodata, alphabet, sqids.min_length)
 
-    if Blocklist.is_blocked_id(sqids.blocklist, id) do
+    if Blocklist.blocked_id?(sqids.blocklist, id) do
       # ID has a blocked word, restart with a +1 attempt_index
       attempt_to_encode_numbers(sqids, list, attempt_index + 1)
     else
@@ -391,7 +391,7 @@ defmodule Sqids do
   end
 
   defp are_all_chars_in_id_known(id, alphabet) do
-    id |> String.graphemes() |> Enum.all?(&Alphabet.is_known_symbol(alphabet, &1))
+    id |> String.graphemes() |> Enum.all?(&Alphabet.known_symbol?(alphabet, &1))
   end
 
   @spec decode(t(), String.t()) :: {:ok, [non_neg_integer]}
diff --git a/lib/sqids/alphabet.ex b/lib/sqids/alphabet.ex
index 56739ff..0ce5667 100644
--- a/lib/sqids/alphabet.ex
+++ b/lib/sqids/alphabet.ex
@@ -94,12 +94,12 @@ defmodule Sqids.Alphabet do
     Enum.reduce((size - 1)..0, _acc = [], fn index, acc -> [char_at!(alphabet, index) | acc] end)
   end
 
-  @spec is_known_symbol(t(), String.t()) :: boolean
-  def is_known_symbol(%{} = alphabet, <<arg_char>>) do
+  @spec known_symbol?(t(), String.t()) :: boolean
+  def known_symbol?(%{} = alphabet, <<arg_char>>) do
     Enum.any?(alphabet, fn {_index, char} -> arg_char === char end)
   end
 
-  def is_known_symbol(%{} = _alphabet, multibyte) when byte_size(multibyte) > 1 do
+  def known_symbol?(%{} = _alphabet, multibyte) when byte_size(multibyte) > 1 do
     false
   end
 
diff --git a/lib/sqids/blocklist.ex b/lib/sqids/blocklist.ex
index 3f3f769..2d75ecf 100644
--- a/lib/sqids/blocklist.ex
+++ b/lib/sqids/blocklist.ex
@@ -32,8 +32,8 @@ defmodule Sqids.Blocklist do
     end
   end
 
-  @spec is_blocked_id(t(), String.t()) :: boolean()
-  def is_blocked_id(%__MODULE__{} = blocklist, id) do
+  @spec blocked_id?(t(), String.t()) :: boolean()
+  def blocked_id?(%__MODULE__{} = blocklist, id) do
     downcased_id = String.downcase(id)
     downcased_size = byte_size(downcased_id)
 
diff --git a/test/sqids_test.exs b/test/sqids_test.exs
index 9ac2972..8203d8e 100644
--- a/test/sqids_test.exs
+++ b/test/sqids_test.exs
@@ -584,7 +584,7 @@ defmodule SqidsTest do
     test "Blocklist: short words are not blocked" do
       alphabet_str = "abc"
       {:ok, blocklist} = Sqids.Blocklist.new(["abc"], _min_word_length = 4, alphabet_str)
-      refute Sqids.Blocklist.is_blocked_id(blocklist, "abc")
+      refute Sqids.Blocklist.blocked_id?(blocklist, "abc")
     end
 
     test "Stopped agent" do