diff --git a/HISTORY.md b/HISTORY.md
index b992a6d1..849b7b30 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,5 +1,17 @@
 # ripple-lib Release History
 
+## UNRELEASED
+
++ Add address/secret/key validation and derivation methods ([#932](https://github.com/ripple/ripple-lib/pull/932))
+  + `isValidAddress(address: string) : boolean`: Checks if the specified string contains a valid address.
+  + `isValidSecret(secret: string): boolean`: Checks if the specified string contains a valid secret.
+  + `deriveKeypair(seed: string): {privateKey: string, publicKey: string}`: Derive a public and private key from a seed.
+  + `deriveAddress(publicKey: string): string`: Derive an XRP Ledger address from a public key.
++ To derive an address from a secret:
+  1. Derive the public key from the secret.
+  2. Derive the address from the public key.
+  + Example: `const address = api.deriveAddress(api.deriveKeypair(secret).publicKey)`
+
 ## 1.0.0 (2018-08-30)
 
 We are pleased to announce the release of `ripple-lib` version 1.0.0.
diff --git a/docs/index.md b/docs/index.md
index 92594300..a9863cdc 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -5110,13 +5110,13 @@ return api.generateAddress();
 
 ## isValidAddress
 
-`isValidAddress(address: string) : boolean
+`isValidAddress(address: string): boolean`
 
-Checks if the specified string contains a valid ledger address.
+Checks if the specified string contains a valid address.
 
 ### Parameters
 
-This method takes one parameter, the address which to validate.
+This method takes one parameter, the address to validate.
 
 ### Return Value
 
@@ -5130,9 +5130,9 @@ return api.isValidAddress("address")
 
 ## isValidSecret
 
-`isValidSecret(secret: string) : boolean
+`isValidSecret(secret: string): boolean`
 
-Checks if the specified string contains a valid ledger secret.
+Checks if the specified string contains a valid secret.
 
 ### Parameters
 
@@ -5150,7 +5150,7 @@ return api.isValidSecret("secret")
 
 ## deriveKeypair
 
-`deriveKeypair(seed: string) : {privateKey: string, publicKey: string}`
+`deriveKeypair(seed: string): {privateKey: string, publicKey: string}`
 
 Derive a public and private key from a seed.
 
@@ -5172,7 +5172,7 @@ var private_key = keypair.privateKey;
 
 ## deriveAddress
 
-`deriveAddress(publicKey: string) : string
+`deriveAddress(publicKey: string): string`
 
 Derive an XRP Ledger address from a public key.
 
diff --git a/docs/src/deriveAddress.md.ejs b/docs/src/deriveAddress.md.ejs
index 1a8a1e5c..b9ec496f 100644
--- a/docs/src/deriveAddress.md.ejs
+++ b/docs/src/deriveAddress.md.ejs
@@ -1,6 +1,6 @@
 ## deriveAddress
 
-`deriveAddress(publicKey: string) : string
+`deriveAddress(publicKey: string): string`
 
 Derive an XRP Ledger address from a public key.
 
diff --git a/docs/src/deriveKeypair.md.ejs b/docs/src/deriveKeypair.md.ejs
index 8597206d..b8dd163f 100644
--- a/docs/src/deriveKeypair.md.ejs
+++ b/docs/src/deriveKeypair.md.ejs
@@ -1,6 +1,6 @@
 ## deriveKeypair
 
-`deriveKeypair(seed: string) : {privateKey: string, publicKey: string}`
+`deriveKeypair(seed: string): {privateKey: string, publicKey: string}`
 
 Derive a public and private key from a seed.
 
diff --git a/docs/src/isValidAddress.md.ejs b/docs/src/isValidAddress.md.ejs
index 4805d080..ff61b20f 100644
--- a/docs/src/isValidAddress.md.ejs
+++ b/docs/src/isValidAddress.md.ejs
@@ -1,12 +1,12 @@
 ## isValidAddress
 
-`isValidAddress(address: string) : boolean
+`isValidAddress(address: string): boolean`
 
-Checks if the specified string contains a valid ledger address.
+Checks if the specified string contains a valid address.
 
 ### Parameters
 
-This method takes one parameter, the address which to validate.
+This method takes one parameter, the address to validate.
 
 ### Return Value
 
diff --git a/docs/src/isValidSecret.md.ejs b/docs/src/isValidSecret.md.ejs
index bfce3000..66bf1952 100644
--- a/docs/src/isValidSecret.md.ejs
+++ b/docs/src/isValidSecret.md.ejs
@@ -1,8 +1,8 @@
 ## isValidSecret
 
-`isValidSecret(secret: string) : boolean
+`isValidSecret(secret: string): boolean`
 
-Checks if the specified string contains a valid ledger secret.
+Checks if the specified string contains a valid secret.
 
 ### Parameters